class EncryptAndDecrypt {
   String encrypt(String sourceString,String password) {
	char [] p = password.toCharArray();
	int n = p.length;
	char [] c = sourceString.toCharArray();
	int m = c.length;
	for(int k=0;k<m;k++) {
		int mima = c[k]+p[k%n];
		c[k] = (char)mima;
	}
	return new String(c);
	}
	String decrypt(String sourceString,String password) {
	char [] p = password.toCharArray();
	int n = p.length;
	char [] c = sourceString.toCharArray();
	int m = c.length;
	for(int k=0;k<m;k++) {
	int mima = c[k]-p[k%n];
	c[k] = (char)mima;
	}
	return new String(c);
}
}
